Excellent for office use and mass mailing projects, the Telko LF283B High Speed Letter Folder can fold up to 4000 sheets per hour of paper in 4 of the most popular formats. It''s perfect for office use and mass mailing projects. This High Speed Letter Folder handles large volumes of paper for business applications. Folds letter, legal and A4 paper sizes. Unlimited uses including: monthly statements, invoices, brochures, reports, flyers, mailers, newsletter, bulletins and much more!